Positional Differences in Nitrogen and Sugar Concentrations of Upper Leaves Relate to Plant N Status in Rice under Different N Rates

Wang SH, Zhu Y, Jiang HD and Cao WX. Positional Differences in Nitrogen and Sugar Concentrations of Upper Leaves Relate to Plant N Status in Rice under Different N Rates. Field Crop Research. 2006, 96 (2006) ：224-234．